Author Topic: Tires for 1978 Trans Am with 15 x 7 rims  (Read 18733 times)

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Offline rotary

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Tires for 1978 Trans Am with 15 x 7 rims
« on: April 06, 2007, 06:08:10 PM »
Hi:
I have a 1978 Trans Am with factory OEM rally wheels which I think will be 15 x 7.
I am starting to restore this now and I was think about putting on B.F. Goodrich Radial T/A tires P225/70R15 tires.
What do you guys think? Do I need bigger or smaller or are these just right?
Car will have pretty much stock W72 engine with headers and automatic.
Thanks!

Offline Gold78Spc

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #1 on: April 06, 2007, 06:32:24 PM »
I think thats a pretty good sized tire for that car.
78 Gold Special Edition TA
96 GMC Sierra
99 Diamondback 18 Spd
00 Ford Windstar
04 Buick Rendezvous
05 Roadmaster tricycle


Keep on Moppin' in the Free world.

Offline brooksman9

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #2 on: April 06, 2007, 06:42:24 PM »
Look at my blue firebird in this post. I have P225/70R15 tires.I would personally like something a little wider but I didn't buy these and at this rate will never wear them out.
http://www.78ta.com/smf/index.php?topic=3060.0
« Last Edit: April 06, 2007, 06:44:37 PM by brooksman9 »

Offline rotary

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #3 on: April 06, 2007, 06:46:28 PM »
Gents:
Thanks for the info. You have confirmed what I was thinking. I have had 3 Trans Ams (1975,1977,1979)plus this 1978 I just bought. But the first 3 were many years ago and I could not remember what tires I had on them.
Thanks!

Offline 78TransAm

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #4 on: April 07, 2007, 11:37:06 PM »
Seems the most popular size tires I have seen on 7" and 8" wheels are 255/60/15's and 245/60/15's...Some even go beefier in the back.
Warner Robins, GA

1978 Trans Am
1974 Trans Am

Offline rotary

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #5 on: April 07, 2007, 11:45:31 PM »
I was wondering about 60 series tires. Does that effect handling? Good or bad? I am limited in Tires size as I am in Saudi Arabia. I can get P225/R7015 but Firestone Firehawk GTA with whitewalls. Next are Firestone wide ovals but only 205 in a 65 or 60 series.
I am thinking to buy tires in states and ship on car. Goodrich T/A radials 225/70/15
I want kind of a factory look and I think that was factory size for 1978 TransAms.
Thanks

Offline Gattzu

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #6 on: April 11, 2007, 03:06:21 PM »
I have 295/50/15 on the 8" Snowflakes, they don't rub or anything. I've seen them on the 7" flakes but they rub a little on the inner fenders. Have my 345/55 when I finish my mini-tub :)

Offline Tbird

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #7 on: April 11, 2007, 06:22:09 PM »

I have 225/70/15's on my factory Rally II wheels.
I think its the tires having TA on them on a T/A that just fitting.

Offline MalteseFalcon

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #8 on: April 13, 2007, 01:00:58 AM »
I was wondering about 60 series tires. Does that effect handling? Good or bad? I am limited in Tires size as I am in Saudi Arabia. I can get P225/R7015 but Firestone Firehawk GTA with whitewalls. Next are Firestone wide ovals but only 205 in a 65 or 60 series.
I am thinking to buy tires in states and ship on car. Goodrich T/A radials 225/70/15
I want kind of a factory look and I think that was factory size for 1978 TransAms.
Thanks

225/70/15 was the factory size for the WS6 on 8" wheels in 1978, but after that year that size was used by the factory on all Trans Am on both 7" and 8" wheels. If you look at any factory promo pics of a 1978 WS6 or a 1979-81 Trans Am, you're looking at that tire size.

Generally, more rubber = more grip and better handling, although bigger tires are more prone to "squirm" and some dartiness on center. 255 R60 15's will fit in the stock wheel wells of most Firebirds, though, without rubbing. They look wide, but not aftermarket wide. I have them on my '78 Trans Am, and like the way they look and handle.
Steve

1978 WS6 W72 4 Speed - Martinique Blue on Light Blue - Fire Am restification Project

Offline chitownTA

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #9 on: April 14, 2007, 02:03:02 AM »
I put 255 60's all the way around and ended up with the passenger side front rubbing the fender above it and cutting it up on my 15x8 snowflakes.  Also saw some rub marks on the inner sway bar i believe.  Going to replace it with 235s I originally had with no problems.

Offline rotary

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Re: Tires for 1978 Trans Am with 15 x 7 rims
« Reply #10 on: April 15, 2007, 06:14:11 AM »
I think I will go with the 225s like TBIRD has.Thanks for all the input!